A singlet triplet hole spin qubit in planar Ge

Abstract

Spin qubits are considered to be among the most promising candidates for building a quantum processor. GroupIV hole spin qubits have moved into the focus of interest due to the ease of operation and compatibility with Si technology. In addition, Ge offers the option for monolithic superconductor-semiconductor integration. Here we demonstrate a hole spin qubit operating at fields below 10 mT, the critical field of Al, by exploiting the large out-of-plane hole g-factors in planar Ge and by encoding the qubit into the singlet-triplet states of a double quantum dot. We observe electrically controlled g-factor-difference-driven and exchange-driven rotations with tunable frequencies exceeding 100 MHz and dephasing times of 1 $\mu$s which we extend beyond 150 $\mu$s with echo techniques. These results demonstrate that Ge hole singlet-triplet qubits are competing with state-of-the art GaAs and Si singlet-triplet qubits. In addition, their rotation frequencies and coherence are on par with Ge single spin qubits, but they can be operated at much lower fields underlining their potential for on chip integration with superconducting technologies.

References in corpus (38)

• Quantum Computation with Quantum Dots
• Circuit Quantum Electrodynamics: Coherent Coupling of a Single Photon to a Cooper Pair Box
• A >99.9%-fidelity quantum-dot spin qubit with coherence limited by charge noise
• Universal quantum computation with spin-1/2 pairs and Heisenberg exchange
• A four-qubit germanium quantum processor
• The germanium quantum information route
• Electrometry Using Coherent Exchange Oscillations in a Singlet-Triplet-Qubit
• Reduced sensitivity to charge noise in semiconductor spin qubits via symmetric operation
• Fast two-qubit logic with holes in germanium
• A coherent beam splitter for electronic spin states
• Ge hole spin qubit
• Noise suppression using symmetric exchange gates in spin qubits
• Strong Spin-Orbit Interaction and Helical Hole States in Ge/Si Nanowires
• Suppressing qubit dephasing using real-time Hamiltonian estimation
• Superconductor-semiconductor hybrid cavity quantum electrodynamics
• Composite pulses for robust universal control of singlet-triplet qubits
• Two-axis control of a singlet-triplet qubit with an integrated micromagnet
• Ultrafast Hole Spin Qubit with Gate-Tunable Spin-Orbit Switch
• Low disordered, stable, and shallow germanium quantum wells: a playground for spin and hybrid quantum technology
• Digital coherent control of a superconducting qubit
• Probing low noise at the MOS interface with a spin-orbit qubit
• Fast charge sensing of a cavity-coupled double quantum dot using a Josephson parametric amplifier
• Optimal operation points for ultrafast, highly coherent Ge hole spin-orbit qubits
• Heavy hole states in Germanium hut wires
• Machine learning enables completely automatic tuning of a quantum device faster than human experts
• Germanium quantum well Josephson field effect transistors and interferometers
• Light effective hole mass in undoped Ge/SiGe quantum wells
• Closed-loop control of a GaAs-based singlet-triplet spin qubit with 99.5% gate fidelity and low leakage
• Resonantly driven singlet-triplet spin qubit in silicon
• Spin-orbit Interactions for Singlet-Triplet Qubits in Silicon
• Spin filling and orbital structure of the first six holes in a silicon metal-oxide-semiconductor quantum dot
• Relaxation and Readout Visibility of a Singlet-Triplet Qubit in an Overhauser Field Gradient
• Enhanced charge detection of spin qubit readout via an intermediate state
• Observation of spin-selective tunneling in SiGe nanocrystals
• Readout Of Singlet-Triplet Qubits At Large Magnetic Field Gradients
• Radio-frequency reflectometry of a quantum dot using an ultra-low-noise SQUID amplifier
• Assessing the potential of Ge/SiGe quantum dots as hosts for singlet-triplet qubits
• Depletion-mode Quantum Dots in Intrinsic Silicon

Cited by in corpus (105)

• Semiconductor Spin Qubits
• Review of performance metrics of spin qubits in gated semiconducting nanostructures
• Nanomaterials for Quantum Information Science and Engineering
• A single hole spin with enhanced coherence in natural silicon
• Squeezed hole spin qubits in Ge quantum dots with ultrafast gates at low power
• Simultaneous single-qubit driving of semiconductor spin qubits at the fault-tolerant threshold
• Parity-conserving Cooper-pair transport and ideal superconducting diode in planar Germanium
• Recent advances in hole-spin qubits
• Dynamics of hole singlet triplet qubits with large g-factor differences
• Sweet-spot operation of a germanium hole spin qubit with highly anisotropic noise sensitivity
• Hard superconducting gap in germanium
• Electrical control of the $g$-tensor of a single hole in a silicon MOS quantum dot
• Coherent spin qubit shuttling through germanium quantum dots
• Fully tunable longitudinal spin-photon interactions in Si and Ge quantum dots
• Germanium wafers for strained quantum wells with low disorder
• A silicon singlet-triplet qubit driven by spin-valley coupling
• Lightly-strained germanium quantum wells with hole mobility exceeding one million
• Universal control of four singlet-triplet qubits
• Hole Spin Qubits in Ge Nanowire Quantum Dots: Interplay of Orbital Magnetic Field, Strain, and Growth Direction
• Gate-Controlled Quantum Dots Based on Two-Dimensional Materials
• Deep Reinforcement Learning for Efficient Measurement of Quantum Devices
• Strong coupling between a microwave photon and a singlet-triplet qubit
• Gate-Tunable Spin-Orbit Coupling in a Germanium Hole Double Quantum Dot
• Probing resonating valence bonds on a programmable germanium quantum simulator
• Electrical operation of planar Ge hole spin qubits in an in-plane magnetic field
• A gate tunable transmon qubit in planar Ge
• All-electrical control of hole singlet-triplet spin qubits at low leakage points
• A singlet-triplet hole-spin qubit in MOS silicon
• Impact of interface traps on charge noise, mobility and percolation density in Ge/SiGe heterostructures
• Hole spin qubits in thin curved quantum wells
• High-fidelity two-qubit gates of hybrid superconducting-semiconducting singlet-triplet qubits
• Strong hole-photon coupling in planar Ge for probing charge degree and strongly-correlated states
• Spin-Valley Protected Kramers Pair in Bilayer Graphene
• Charge-noise induced dephasing in silicon hole-spin qubits
• Enhanced orbital magnetic field effects in Ge hole nanowires
• Fermion-parity qubit in a proximitized double quantum dot
• High-fidelity spin qubit shuttling via large spin-orbit interaction
• Majorana zero modes in gate-defined germanium hole nanowires
• Majorana bound states in germanium Josephson junctions via phase control
• A quantum dot in germanium proximitized by a superconductor
• Exploiting epitaxial strained germanium for scaling low noise spin qubits at the micron-scale
• Electrical operation of hole spin qubits in planar MOS silicon quantum dots
• Magnetic gradient free two axis control of a valley spin qubit in SiGe
• Determination of spin-orbit interaction in semiconductor nanostructures via non-linear transport
• Strong Charge-Photon Coupling in Planar Germanium Enabled by Granular Aluminium Superinductors
• Valley-Free Silicon Fins Caused by Shear Strain
• Anisotropic $g$-tensors in hole quantum dots: The role of the transverse confinement direction
• Coupling of hole double quantum dot in planar germanium to a microwave cavity
• Microscopic analysis of proximity-induced superconductivity and metallization effects in superconductor-germanium hole nanowires
• Cross-architecture Tuning of Silicon and SiGe-based Quantum Devices Using Machine Learning
• Single-step high-fidelity three-qubit gates by anisotropic chiral interactions
• Fingerprints of Qubit Noise in Transient Cavity Transmission
• High quality CVD deposition of Ge layers for Ge/SiGe Quantum Well heterostructures
• Wigner-molecularization-enabled dynamic nuclear field programming
• Combining n-MOS Charge Sensing with p-MOS Silicon Hole Double Quantum Dots in a CMOS platform
• Effective out-of-plane g-factor in strained-Ge/SiGe quantum dots
• Reducing disorder in Ge quantum wells by using thick SiGe barriers
• Dephasing of planar Ge hole spin qubits due to 1/$\text{f}$ charge noise
• Majorana-Kondo competition in a cross-shaped double quantum dot-topological superconductor system
• Acceptor-based qubit in silicon with tunable strain
• Probing details of spin--orbit coupling through Pauli spin blockade
• Effects of spin-orbit coupling and in-plane Zeeman fields on the critical current in two-dimensional hole gas SNS junctions
• Artificial Intelligence-Assisted Workflow for Transmission Electron Microscopy: From Data Analysis Automation to Materials Knowledge Unveiling
• Pauli spin blockade with site-dependent g-tensors and spin-polarized leads
• InP/GaSb core-shell nanowires: a novel hole-based platform with strong spin-orbit coupling for full-shell hybrid devices
• Tailoring potentials by simulation-aided design of gate layouts for spin qubit applications
• Quantum geometric protocols for fast high-fidelity adiabatic state transfer
• A backgate for enhanced tunability of holes in planar germanium
• Light-hole spin confined in germanium
• Optimal operation of hole spin qubits
• A spinless spin qubit
• Protocols to measure the non-Abelian Berry phase by pumping a spin qubit through a quantum-dot loop
• Gate-based spin readout of hole quantum dots with site-dependent $g-$factors
• Semiconductor-based electron flying qubits: Review on recent progress accelerated by numerical modelling
• Mitigation of exchange cross-talk in dense quantum dot arrays
• Longitudinal coupling between electrically driven spin-qubits and a resonator
• YSR Bond Qubit in a Double Quantum Dot with cQED Operation
• Investigation of Lasing in Highly Strained Germanium at the Crossover to Direct Band Gap
• Electrical manipulation of a hole `spin'-orbit qubit in nanowire quantum dot: the nontrivial magnetic field effects
• All rf-based tuning algorithm for quantum devices using machine learning
• A dressed singlet-triplet qubit in germanium
• Polarimetry With Spins in the Solid State
• Resonator-mediated quantum gate between distant charge qubits
• Radiofrequency cascade readout of coupled spin qubits
• Quantification of the heavy-hole--light-hole mixing in two-dimensional hole gases
• Transmission-based noise spectroscopy for quadratic qubit-resonator interactions
• Electrical readout of spins in the absence of spin blockade
• True decoherence-free-subspace derived from a semiconductor double quantum dot Heisenberg spin-trimer
• The role of antisymmetric orbitals and electron-electron interactions on the two-particle spin and valley blockade in graphene double quantum dots
• Effect of disorder and strain on the operation of planar Ge hole spin qubits
• Enhancing atomic-resolution in electron microscopy: A frequency-domain deep learning denoiser
• Theory of qubit noise characterization using the long-time cavity transmission
• Variability of hole spin qubits in planar Germanium
• Photoionization detection of a single Er${}^{3+}$ ion with sub-100-ns time resolution
• Model validation and error attribution for a drifting qubit
• Dressed basis sets for the modeling of exchange interactions in double quantum dots
• Acoustic phonons, spin-phonon coupling and spin relaxation via the lattice reorientation mechanism in hexagonal germanium nanowires
• Supercurrent and multiple Andreev reflections in Ge hut nanowire Josephson Junctions
• Role of anisotropic confining potential and elliptical driving in dynamics of a Ge hole qubit
• Study of Magnetic Field Resilient High Impedance High-Kinetic Inductance Superconducting Resonators
• Switchable spin-photon coupling with hole spins in single-quantum dots
• Sweet-spot protection of hole spins in sparse arrays via spin-dependent magnetotunneling
• Anomalous zero-field splitting for hole spin qubits in Si and Ge quantum dots
• Theory of Electron Spin Resonance Scanning Tunneling Microscopy: The First Decade
• Fully tunable hyperfine interactions of hole spin qubits in Si and Ge quantum dots